...
Specifies the data to be used in the plotting of a thermodynamic diagram from model field data. The icon field assist button provides a tailor made MARS request in case you need some guidance in the data specification. The requested data are gridded model fields of Temperature, Logarithm of Surface Pressure and Specific Humidity. Fieldsets Temperature and Specific Humidity must have the same number of levels and they will be used to compute the Dew Point parameter . Fieldsets U and V wind components are optional, but if given they will be used to compute the wind vectors data unit. These two components must have the same number of levels, but not necessarily have the same number of levels of Temperature and Specific Humidity.
Output
Specifies the output format you want. Specify one of the geopoints formats (Geographical Points, Geographical Polar Vectors or Geographical X Y Vectors).
Parameter
...
Point Selection
Specifies how the geographical location, for which the diagram is to be plotted, will be selected. Options are: Coordinates, Area Average and Station.
Coordinates
Specifies the latitude/longitude location for which the diagram is to be plotted.
Area Average
Specifies a geographical area (lat1/lon1/lat2/lon2) over which an area average value will be used, instead of a point value, to produce the diagram.
Station
Specifies the location for which the diagram is to be plotted. In the Bufr Thermo dialogue, this must define a meteorological station that does full upper air soundings. In the Grib Thermo dialogue, this may represent any arbitrary geographical point.
Point Extraction
Specifies the way to calculate values at the point location for GRIB thermodynamic diagrams. Options are:
• Interpolate - interpolate values from the surrounding grid points (default)
• Nearest - using the data of the nearest grid point
Missing Data
If set to Ignore, missing data is not included in the output file; this is the default behaviour. If set to Include, missing data will be output to the geopoints file, its value being set to that specified by Missing Data Value. Note that when the output format is one of the two geopoints vector formats, the observation is considered missing if one or both of the parameters are missing.